Re: Luna as Surrounds mounted horizontally?
Are you mostly music or movies? If movies, I'm not so sure how important timbre matching is, particularly for heights/Atmos, as this is usually just effects and not sure if one could hear a difference.
To address Curtis' question, I don't think there is a spec for height/ATMOS speakers. Most multi-channel AVRs might give 60 wpc for heights/ATMOS.
Personally, for sides/surrounds/heights, especially if mainly for movies, I don't think one needs to go "overboard" with expensive speakers. The HTM200s work really great for these channels, even paired with RAAL-equipped speakers.
* LG OLED65E6P, BenqHT2050A
* Anthem AVM90, Rogue ST100, VTV Pascal 7 ch
* Sierra Towers/Horizon (all ELX RAAL), S2EXv2 surrounds, HTM200SEx4 heights, Rythmik E15HPx2
* VPI Classic 1+ (VTA & Fatboy Gimbal), PE Eagle/RR, VAS NOVA, Soundsmith Paua, Manley Chinook, Bob's Devices SUT, SugarCube 1 mini
* Oppo 203 & 103D, EverSolo DMP-A6
* miniDSP Flex, Audiosensibility & Blue Jeans cables, Symposium & Isoacoustics, GIK
* For RDJ: Anthem MRX720, Sierra LX, Luna Duo v2 center, CXNv2, TBD